<!DOCTYPE html>
<html lang="zh">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body {
            width: 960px;
            text-align: center;
            margin: 200px auto;
            background-color: yellow;
        }

        .lf {
            float: left;
        }

        .rf {
            float: right;
        }

        .mb-10 {
            margin-bottom: 10px;
        }

        .ml-10 {
            margin-left: 10px;
        }

        .mr-10 {
            margin-right: 10px;
        }

        .mt-10 {
            margin-top: 10px;
        }

        .brb {
            background-color: blue;
        }

        .bcr {
            background-color: red;
        }

        .bcy {
            background-color: rgb(28, 81, 137);
        }

        .bbb {
            background-color: aquamarine;
        }

        .oiu {
            background-color: blanchedalmond;
        }

        .float1 {
            width: 240px;
            height: 350px;
        }

        .float2 {
            width: 720px;
            height: 350px;
        }

        .float3 {
            width: 77.5px;
            height: 65px;
        }

        .float4 {
            width: 232.5px;
            height: 130px;
        }

        .float5 {
            width: 240px;
            height: 35px;
        }
    </style>
</head>

<body>
    <div>
        <div class="lf float1 mb-10">
            <div class="float5 brb"></div>
            <div class="float5 bcr"></div>
            <div class="float5 brb"></div>
            <div class="float5 bcr"></div>
            <div class="float5 brb"></div>
            <div class="float5 bcr"></div>
            <div class="float5 brb"></div>
            <div class="float5 bcr"></div>
            <div class="float5 brb"></div>
            <div class="float5 bcr"></div>
        </div>
        <div class="lf float2 bbb mb-10"></div>
    </div>
    <div>
        <div class="lf float4">
            <div class="lf float3 bcr"></div>
            <div class="lf float3 brb"></div>
            <div class="lf float3 bcr"></div>
            <div class="lf float3 brb"></div>
            <div class="lf float3 bcr"></div>
            <div class="lf float3 brb"></div>
        </div>
        <div class="lf float4 bcr ml-10"></div>
        <div class="lf float4 brb ml-10"></div>
        <div class="lf float4 bcr ml-10"></div>
    </div>
</body>

</html>